Source/WebCore/css/parser/CSSTokenizerInputStream.cpp

// Copyright 2014 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 Apple Inc. All rights reserved.
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#include "config.h"
#include "CSSTokenizerInputStream.h"

#include "HTMLParserIdioms.h"

namespace WebCore {

CSSTokenizerInputStream::CSSTokenizerInputStream(const String& input)
    : m_offset(0)
    , m_stringLength(input.length())
    , m_string(input.impl())
{
}

void CSSTokenizerInputStream::advanceUntilNonWhitespace()
{
    // Using HTML space here rather than CSS space since we don't do preprocessing
    if (m_string->is8Bit()) {
        const LChar* characters = m_string->characters8();
        while (m_offset < m_stringLength && isHTMLSpace(characters[m_offset]))
            ++m_offset;
    } else {
        const UChar* characters = m_string->characters16();
        while (m_offset < m_stringLength && isHTMLSpace(characters[m_offset]))
            ++m_offset;
    }
}

double CSSTokenizerInputStream::getDouble(unsigned start, unsigned end) const
{
    ASSERT(start <= end && ((m_offset + end) <= m_stringLength));
    bool isResultOK = false;
    double result = 0.0;
    if (start < end) {
        if (m_string->is8Bit())
            result = charactersToDouble(m_string->characters8() + m_offset + start, end - start, &isResultOK);
        else
            result = charactersToDouble(m_string->characters16() + m_offset + start, end - start, &isResultOK);
    }
    // FIXME: It looks like callers ensure we have a valid number
    return isResultOK ? result : 0.0;
}

} // namespace WebCore